I Built 16 Browser-Based Developer Tools That Never Upload Your Data.

I Built 16 Browser-Based Developer Tools That Never Upload Your Data
As a developer, I often find myself needing a quick tool for something small:

Format some JSON

Decode a JWT

Encode a string with Base64

Generate a UUID

Convert JSON to CSV

Convert JSON to YAML

Encode or decode a URL

Minify or validate JSON

Convert data into code

The problem is that these small tasks often mean opening a different website every time. And when the data contains API responses, configuration files, tokens, or other sensitive information, pasting it into an online service isn't always ideal.
So I built PureDevUtils.

Try it: https://puredevutils.com

What is PureDevUtils?
PureDevUtils is a collection of free, browser-based developer utilities designed for everyday development tasks.
The current toolkit includes utilities for:

JSON formatting

JSON validation

JSON minification

JSON diffing

JWT decoding

Base64 encoding

Base64 decoding

URL encoding

URL decoding

UUID generation

JSON to CSV conversion

JSON to YAML conversion

TypeScript conversion

Python conversion

Java conversion

And other small developer utilities
The goal is simple: make common developer tasks fast and convenient without requiring an account.

Privacy-first by design
One of the main things I wanted from the project was local processing.

For tools that operate entirely in the browser, the data is processed client-side rather than being uploaded to a backend server.
That means you can work with things like JSON responses, configuration data, encoded strings, and other development data without having to send that content to a third-party processing service.

I think this is particularly useful when working with development data that you don't want leaving your browser.
Built with Next.js and TypeScript
PureDevUtils is built primarily with:

Next.js

TypeScript

JavaScript

Vitest for testing

TypeScript makes it easier to keep the different utilities predictable and maintainable, while Next.js provides the application framework and routing.

I also wanted the individual tools to stay lightweight and focused rather than turning the project into a complicated developer platform.

Why build another developer toolkit?
There are already many great developer utilities available online.
I wasn't trying to replace every existing tool.
Instead, I wanted something I would personally want to bookmark: a single place where I could quickly perform common development tasks without signing up, dealing with unnecessary complexity, or sending data to a server when client-side processing was enough.
That's essentially what PureDevUtils became.

What's next?
I'm planning to keep adding useful developer utilities based on what developers actually need.
I'd especially like feedback on:

Which tools you use most frequently?

Which utilities are missing?

Which workflows could be made faster?

Any bugs or edge cases you encounter

If there's a developer utility you repeatedly search for, let me know. It might be a good candidate for PureDevUtils.

Try PureDevUtils

If you work with JSON, JWTs, Base64, URLs, UUIDs, CSV, YAML, or other developer data regularly, give it a try:

https://puredevutils.com

It's free, browser-based, and built to make those small developer tasks a little easier.